Guess who's headed to Iowa? File this one under 2016…or 2020.

Former Florida Gov. Jeb Bush is heading to Sioux City in October. He will be the keynote speaker at the Siouxland Chamber of Commerce Annual Dinner on Oct. 8. A spokesperson for Bush confirms the speaking engagement, first reported by ABC News' Sioux City affiliate KCAU.

Although he has repeatedly ruled out sharing the ballot with Mitt Romney, telling ABC News' Jon Karl just last month, "I am not a candidate … I'm not going to be asked," he has left the door open to a future run for the White House, telling CBS' Charlie Rose in June he has "not made that decision" when asked if he will run in the future.

Iowa, home to the famous Iowa caucuses, is traditionally the state where voters first cast their ballot. Like the first primary state of New Hampshire, candidates with presidential aspirations spend a lot of time in there, shaking hands and kissing babies, as they say.

Of course, Iowa is also a presidential battleground state and the dinner will come just a month before voters go to the polls to decide between President Barack Obama, who won the state four years ago, or Mitt Romney, whom Bush has backed and hit the campaign trail for, most recently in Ohio.

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